The Claim
In young, resistance-trained individuals, 8 weeks of twice-weekly leg press and leg extension training with 5 sets of 12 repetitions, performed as either traditional or cluster sets, results in significant increases in thigh lean tissue mass and rectus femoris muscle thickness under volume- and effort-matched conditions.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In young people who regularly lift weights, performing leg exercises twice a week for 8 weeks with a specific number of sets and reps increases the size of thigh muscle and lean tissue, regardless of whether the sets are done traditionally or with short breaks between reps.
See the scientific wording
In young, resistance-trained individuals, 8 weeks of twice-weekly leg press and leg extension training with 5 sets of 12 repetitions (either as traditional or cluster sets) leads to significant increases in thigh lean tissue mass and rectus femoris muscle thickness, confirming that both protocols are effective for hypertrophy under volume- and effort-matched conditions.
When muscles are worked hard under load, the force pulling on muscle fibers activates signals inside the cells that tell them to build more protein. This causes the fibers to get thicker over time, increasing muscle size.
What the research says
1 studyIf you're already experienced with lifting and train your legs twice a week with hard sets, your muscles grow just as much whether you take short breaks between reps or not—as long as you do the same total amount of work and push yourself just as hard.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.